• Masami Hiramatsu's avatar
    perf probe: Support --line option to show probable source-code lines · 631c9def
    Masami Hiramatsu authored
    Add --line option to support showing probable source-code lines.
    
      perf probe --line SRC:LN[-LN|+NUM]
       or
      perf probe --line FUNC[:LN[-LN|+NUM]]
    
    This option shows source-code with line number if the line can
    be probed. Lines without line number (and blue color) means that
    the line can not be probed, because debuginfo doesn't have the
    information of those lines.
    
    The argument specifies the range of lines, "source.c:100-120"
    shows lines between 100th to l20th in source.c file. And
    "func:10+20" shows 20 lines from 10th line of func function.
    
    e.g.
     # ./perf probe --line kernel/sched.c:1080
     <kernel/sched.c:1080>
              *
              * called with rq->lock held and irqs disabled
              */
             static void hrtick_start(struct rq *rq, u64 delay)
             {
                    struct hrtimer *timer = &rq->hrtick_timer;
       1086         ktime_t time = ktime_add_ns(timer->base->get_time(), delay);
    
                    hrtimer_set_expires(timer, time);
    
       1090         if (rq == this_rq()) {
       1091                 hrtimer_restart(timer);
       1092         } else if (!rq->hrtick_csd_pending) {
       1093                 __smp_call_function_single(cpu_of(rq), &rq->hrtick_csd,
       1094                 rq->hrtick_csd_pending = 1;
    
    If you specifying function name, this shows function-relative
    line number.
    
     # ./perf probe --line schedule
     <schedule:0>
             asmlinkage void __sched schedule(void)
          1  {
                    struct task_struct *prev, *next;
                    unsigned long *switch_count;
                    struct rq *rq;
                    int cpu;
    
             need_resched:
                    preempt_disable();
          9         cpu = smp_processor_id();
         10         rq = cpu_rq(cpu);
         11         rcu_sched_qs(cpu);
         12         prev = rq->curr;
         13         switch_count = &prev->nivcsw;
    Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: systemtap <systemtap@sources.redhat.com>
    Cc: DLE <dle-develop@lists.sourceforge.net>
    Cc: Frederic Weisbecker <fweisbec@gmail.com>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Mike Galbraith <efault@gmx.de>
    LKML-Reference: <20100106144534.27218.77939.stgit@dhcp-100-2-132.bos.redhat.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    631c9def
perf-probe.txt 2.52 KB